From: mawupeng <mawupeng1@huawei.com>
To: <ardb@kernel.org>
Cc: <akpm@linux-foundation.org>, <catalin.marinas@arm.com>,
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<mawupeng1@huawei.com>
Subject: Re: [PATCH 0/2] Add support to relocate kernel image to mirrored region
Date: Mon, 23 May 2022 19:48:33 +0800 [thread overview]
Message-ID: <2a8cc751-dd72-6fe7-9a33-d6f24769f57d@huawei.com> (raw)
In-Reply-To: <CAMj1kXFP9kA_rJ8DfP1Ln=W++xL1Rvdojb8ZuNLoOJx2mLkysA@mail.gmail.com>
在 2022/5/20 14:52, Ard Biesheuvel 写道:
> On Fri, 20 May 2022 at 08:52, Ard Biesheuvel <ardb@kernel.org> wrote:
>>
>> On Thu, 19 May 2022 at 13:09, mawupeng <mawupeng1@huawei.com> wrote:
>>>
>>>
>>>
>>> 在 2022/5/7 17:28, mawupeng 写道:
>>>>
>>>>
>>>> 在 2022/5/3 17:58, Ard Biesheuvel 写道:
>>>>> On Tue, 19 Apr 2022 at 08:43, Wupeng Ma <mawupeng1@huawei.com> wrote:
>>>>>>
>>>>>> From: Ma Wupeng <mawupeng1@huawei.com>
>>>>>>
>>>>>> Now system image will perfer to be located to mirrored regions both KASLR
>>>>>> on and off.
>>>>>>
>>>>>
>>>>> Hello Ma Wupeng,
>>>>>
>>>>> I wonder if we could simplify this as follows:
>>>>> - ignore the non-KASLR case for now, and rely on the bootloader > load the image into mirrored memory if it exists;
>>>>
>>>> In grub, memory for static image is allocated via the following path:
>>>>
>>>> grub_cmd_linux
>>>> kernel = grub_malloc(filelen)
>>>> kernel_alloc_addr = grub_efi_allocate_any_pages (kernel_alloc_pages)
>>>> grub_memcpy (kernel_addr, kernel, grub_min(filelen, kernel_size))
>>>> grub_loader_set (grub_linux_boot, grub_linux_unload, 0)
>>>>
>>>> Can we get memory from mirrored region by the following steps:
>>>> 1. get memory map by calling grub_efi_get_memory_map()
>>>> 2. iter all memory map to find a suitable mirrored memory area
>>>> 3. locate kernel image to this area
>>>>
>>>> So, if kaslr is not enabled
>>>> - grub will load kernel into mirrored region
>>>> else
>>>> - arm64-stub.c will relocate kernel image to mirrored region
>>>>
>>>> Is this feasible?
>>>
>>> Is this a feasible proposal to relocate the static kernel image itself
>>> into more reliable memory?
>>>
>>
>> I'm not sure, it all depends on the firmware.
>>
>> When GRUB calls LoadImage(), the firmware will reallocate the image
>> and unpack it there. So it is really the firmware's job to ensure that
>> the image is loaded into a suitable location.
>>
>> I have some code here that implements a EFI based decompressor, and
>> which loads the kernel image into mirrored memory if it exists,
>> without the need to move it again. It could trivially be modified to
>> deal with non-randomized loads as well.
>>
>
> Code is here
> https://git.kernel.org/pub/scm/linux/kernel/git/ardb/linux.git/log/?h=efi-decompressor-v2
I will test this later.
Thanks.
> .
next prev parent reply other threads:[~2022-05-23 11:48 UTC|newest]
Thread overview: 31+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-04-14 10:13 [PATCH v2 0/9] introduce mirrored memory support for arm64 Wupeng Ma
2022-04-14 10:13 ` [PATCH v2 1/9] efi: Make efi_print_memmap() public Wupeng Ma
2022-04-14 10:13 ` [PATCH v2 2/9] arm64: efi: Add fake memory support Wupeng Ma
2022-04-14 10:13 ` [PATCH v2 3/9] efi: Make efi_find_mirror() public Wupeng Ma
2022-04-14 10:13 ` [PATCH v2 4/9] arm64/mirror: arm64 enabling - find mirrored memory ranges Wupeng Ma
2022-04-14 10:13 ` [PATCH v2 5/9] mm: Ratelimited mirrored memory related warning messages Wupeng Ma
2022-04-14 10:13 ` [PATCH v2 6/9] mm: Demote warning message in vmemmap_verify() to debug level Wupeng Ma
2022-04-14 10:13 ` [PATCH v2 7/9] mm: Calc the right pfn if page size is not 4K Wupeng Ma
2022-04-19 9:59 ` David Hildenbrand
2022-04-19 11:14 ` Anshuman Khandual
2022-04-19 18:29 ` Ard Biesheuvel
2022-04-20 22:27 ` Andrew Morton
2022-04-20 22:39 ` Ard Biesheuvel
2022-04-14 10:13 ` [PATCH v2 8/9] efi: Disable mirror feature if kernelcore is not specified Wupeng Ma
2022-04-14 10:13 ` [PATCH v2 9/9] ia64/efi: Code simplification in efi_init Wupeng Ma
2022-04-14 10:22 ` [PATCH v2 0/9] introduce mirrored memory support for arm64 Ard Biesheuvel
2022-04-16 1:32 ` mawupeng
2022-04-19 18:32 ` Ard Biesheuvel
2022-04-20 2:13 ` mawupeng
2022-04-19 7:01 ` [PATCH 0/2] Add support to relocate kernel image to mirrored region Wupeng Ma
2022-04-19 7:01 ` [PATCH 1/2] arm64/boot/KASLR: " Wupeng Ma
2022-04-19 7:01 ` [PATCH 2/2] arm64/boot: Add support to relocate kernel image to mirrored region without kaslr Wupeng Ma
2022-05-03 9:58 ` [PATCH 0/2] Add support to relocate kernel image to mirrored region Ard Biesheuvel
2022-05-07 9:28 ` mawupeng
2022-05-19 11:09 ` mawupeng
2022-05-20 6:52 ` Ard Biesheuvel
2022-05-20 6:52 ` Ard Biesheuvel
2022-05-23 11:48 ` mawupeng [this message]
2022-05-23 1:18 ` mawupeng
2022-05-23 14:41 ` Ard Biesheuvel
2022-05-24 1:11 ` mawupeng
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